148 IlL'LLKTIN OF THE 



The cristiigalli is robust, and extends the entire length of the cribrifui-ni. 

 The nun-perforate space is one third as long as the cribriform, thus pre- 

 senting a striking contrast with the same plate of the other Carnivora 

 mentioned in this paper. It is concealed in part by the frontal bone 

 in articulation of the bone with the ci'anium, but in the disarticulated 

 bone it is convex or rounded in outline and nearly equal to the ectotur- 

 binal surface in diameter. From it the ectoturbinal plates in part arise. 

 These last-named plates, with their accompanying convolutions, are well 

 seen on the lateral surface. 



As in the dorj, the cat, the otter, and other carnivores, the nasoturbi- 

 nal, as in the seal in part, arises from the meso-ethmoid. It is held to the 

 mcso-cthmoid one half the length of the latter, at its upper margin. The 

 union does not interfere with free access of air to the olfactory plates. 



Huxley makes a statement, in his " Anatomy of the Vertebrated Ani- 

 mals," to the effect that the ethmoturbinals in the seal are small and flat- 

 tened, and that the latter are aiichf/loscd with the vovier on each side. In 

 a single specimen examined I did not find this to be the case. (See Plate 

 IV. fig. 3. The position of the arrow indicates the septoturbinal space.) 

 It is true that the mass is, on the wliole, flattened ; but the frontal por- 

 tion of the mass is moi'e than usually well developed, and at no point 

 did anchylosis exist. The remarkably tliickenod transverse lamina was 

 probably in this statement mistaken for an exceptional \'a\gy of union. 



In the star-nosed mole, Condi/liira cristata, the ectoturbinals ad- 

 vance forward as far as the anterior end of the transverse lamina. The 

 nasoturbinal extends as far as the third premolar. The first cndoturbinal 

 reaches to the last premolar ; the second and third are of nearly equal 

 size ; all the endoturl)inals presenting uniformly broad contiguous me- 

 dian surfaces, the first and thii'd not connected below the cribriform 

 plate. In ti-ansverse section the ectoturbinals are seen to be four in 

 number, the last being tlie largest. It would here seem that the last 

 is the one retained in the Cheiroptera. 



'J'liK l\TiiMoin BoxE IX THE Cheiroptera.* 



Enough has been said, I ti-ust, of the general ])lan of arrangement 

 of the several parts in the ethmoid bone of mammals, to serve as an 

 inti-ddiiction to the description of the bone in the Cheiroptera. It was, 

 indeed, in attempting to describe the bone as found in the bats that the 

 necessity of a revision of the subject became evident. It is not to bo 



* 'J'hc {'nuii;i rurnisliiiiL,^ tlio liasis of tins study were, with few exceptions, furai.'^luil 

 liy the Jluseuin of ( 'oijiiiarative Zoiih\i;y. 



